@article{fdi:010080667,
  title = {{E}cosystem maturity modulates greenhouse gases fluxes from artificial lakes},
  author = {{C}olas, {F}. and {B}audoin, {J}. {M}. and {B}onin, {P}. and {C}abrol, {L}{\'e}a and {D}aufresne, {M}. and {L}assus, {R}. and {C}ucherousset, {J}.},
  editor = {},
  language = {{ENG}},
  abstract = {{L}entic ecosystems play a major role in the global carbon cycling but the understanding of the environmental determinants of lake metabolism is still limited, notably in small artificial lakes. {H}ere the effects of environmental conditions on lake metabolism and {CO}2 and {CH}4 emissions were quantified in 11 small artificial gravel pit lakes covering a gradient of ecosystem maturity, ranging from young oligotrophic to older, hypereutrophic lakes. {T}he diffusive fluxes of {CO}2 and {CH}4 ranged from -30.10 to 37.78 mmol m(-2) d(-1) and from 3.05 to 25.45 mmol m(-2) d(-1) across gravel pit lakes, respectively. {N}utrients and chlorophyll a concentrations were negatively correlated with {CO}2 concentrations and emissions but positively correlated with {CH}4 concentrations and emissions from lakes. {T}hese findings indicate that, as they mature, gravel pit lakes switch from heterotrophic to autotrophic-based metabolism and hence turn into {CO}2-sinks. {I}n contrast, the emission of {CH}4 increased along the maturity gradient. {A}s a result, eutrophication occurring during ecosystem maturity increased net emissions in terms of climate impact ({CO}2 (equivalent)) due to the higher contribution of {CH}4 emissions. {O}verall, mean {CO}2 (equivalent) emission was 7.9 gm(-2) d(-1), a value 3.7 and 4.7 times higher than values previously reported in temperate lakes and reservoirs, respectively. {W}hile previous studies reported that lakes represent emitters of {C} to the atmosphere, this study highlights that eutrophication may reverse lake contribution to global {C} budgets. {H}owever, this finding is to be balanced with the fact that eutrophication also increased {CH}4 emissions and hence, enhanced the potential impact of these ecosystems on climate. {I}mplementing mitigation strategies for maintaining intermediate levels of maturity is therefore needed to limit the impacts of small artificial waterbodies on climate. {T}his could be facilitated by their small size and should be planned at the earliest stages of artificial lake construction.},
  keywords = {{G}as fluxes ; {E}cosystem metabolism ; {C} cycling ; {E}utrophication ; {A}rtificial lakes},
  booktitle = {},
  journal = {{S}cience of the {T}otal {E}nvironment},
  volume = {760},
  numero = {},
  pages = {144046 [12 p.]},
  ISSN = {0048-9697},
  year = {2021},
  DOI = {10.1016/j.scitotenv.2020.144046},
  URL = {https://www.documentation.ird.fr/hor/fdi:010080667},
}